Padlock



(No Model.) I

A. S. FISHER.

. PADLOGK.

N0. IZ 2,759. v Patented Mar. 4, 1890.

UNITED STATES PATENT OFFICE.

ANDREW S. FISHER, OF BEDFORD, PENNSYLVANIA.

PADLOCK.

SPECIFICATION forming part of Letters Patent No. 422,759, dated March 4,1890.

Application filed February 5, 1889. Serial No. 298,698. (No model.)

To all whom it may concern.-

Be it known that I, ANDREW S. FISHER, a citizen of the United States,residing at Bedford, in the county of Bedt'ord and State ofPennsylvania, have invented certain new and useful Improvements in Locksand Keys; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to improvements in looks and keys; and it consistsin the 0011- struction and combination of the parts thereof, as will bemore fully hereinafter described and claimed.

The essential features of my invention are a shackle controlled by a dogactuated by a toothed tumbler, which in turn is operated by a toothedkey.

The object of my invention is to provide a lock of the character setforth which cannot be readily picked or tampered with by the use ofinstruments ordinarily employed for th s purpose, but which is easilyopened by using the proper form of key, the parts being few 111 numberand of simple and effective construction and operation.

I have fully illustrated my improved look 1n the accompanying drawings,wherein like letters of reference are used to designate similar parts inthe several views, and in which Figure 1 represents a perspective viewof the lock with part of the casing removed. Fig. 2 1s a top plan viewthereof with a part of the casing removed and the toothed dog detached,showing the shackle open. Fig. 3 ma bottom edge elevation of the lockentire. Fig. 1s a detail view of the key. A 1nd1cates the main casing,having proecting studs a, adapted to pass through apertures 111 acovering-plate A and be swaged down'to secure the latter plate to thecasing,

and. thereby securely house the parts of the lock The casingA ispreferably made by casting, but may be otherwise constructed, ifdesired, and has a deep recess a formed therein, partially surrounded atone side by a recess a of less depth. The one side of the casing Aopposite the key-opening is formed with a straight wall of, aligningwith the shackle-opening in the top of the casing, and which also formsthe limitation at this point of the recess a. The said wall is formedwith a recess a, for the purpose more fully hereinafter referred to. Thetop edge of the casing A is also formed with a recess a for thereception of the one end of the shackle, and, having a rear wall, itprevents twisting of shackle by forcible means.

A post 0 rises about centrally from the easing A up through the recessa, and when the plate A" is applied the upper end thereof passes throughan aperture in said plate. Upon this post a a dog 0 is eccentricallymounted, and is constructed with an apertured lug c on one edge thereofand a smaller lug c projecting upward from one side at the one end. Thelug 0' receives one end of a spring S, whose lower end is attached toalug formed with the bottom of the leg of the shackle. The said shackleB is constructed with-a single leg, whose upper end is turned over inorder to engage the recess a in the top of the casing A. The outer edgeof the shackleleg is constructed with a lug 1), adapted to engage therecess a, and thereby limit the movement of and prevent disengagement ofthe shackle from the lock. The inner edge of the shackle is formed witha curved recess 1), with which one end of the dog 0 is adapted toengage. The lower end of the shackle-leg isalso provided with anintegral laterallyprojecting lug 12 to which the lower end of a spring Sis connected, as hereinbefore referred to. The one side of saidshackle-leg is also cut away to form .a shoulder 5 and is curved orconcaved from said shoulder upward.

On the post a, over the dog C, a tumbler D is mounted. This tumbler hasa slot d, of

circular configuration, and a projection. or.

shoulder d at one side thereof to bear against the shoulder 11 ofshackle B. The circular slot (Z receives the lug c of dog 0, whichprojects upward therethrough. The opposite side of the tumbler is alsoformed with a projection (1?, against which the end of the key isadapted to bear, and from said pro j ection, some distance around theperiphery of the tumbler, teeth. (1- are formed. The said tumbler D isformed of substantial circular configuration; but it is not essentiallynecessary that this form should atall times be em ployed so long as thetoothed edge is curved.

At the termination of the teeth (1 a further projection d is formed,which coacts with the key, as will be presently described.

One side of the bottom edge of the casing is provided with anangularly-corrugated key-opening 10, into which a key E is adapted to beinserted. The key is in like manner formed with an angular corrugatedblade or shank, whose one edge is constructed with an indentation orrecess 0, and from this recess 6 outward to the end of the key a seriesof teeth 6 are cut.

As shown in the drawings, the upper end of the casing and the top of theshackle are curved to fit a staple or other device.

The operation of the lock is as follows: \Vhen the key E is inserted,the end thereof strikes the projection (Z of the tumbler D and turns thesame until the teeth d mesh with the teeth c of said key. An inseparableengagement of the key and tumbler is thus provided, and as the key isfarther pressed into the lock the tumbler continues to revolve on post0. As soon as the said tumblerD starts to revolve it draws the dog 0around therewith through the lug 0 The dogO is turned in the directionof the arrow and pulls the spring S until said dog has traveled past itscenter, when the shackle B is unlocked and automaticallyimpelled outwardby the action of said spring, which is secured to the lower end thereof,as fully set forth. The shackle B now having moved outward, its lowerend draws up close to the dog 0, and the retractile effort of the springS becomes relaxed, the parts assuming the position shown in Fig. 2. Inwithdrawing the key the tumbler D is brought back to its normalcondition, and in closing the shackle the spring S draws on the dog 0and throws it back to its normal locking position, and also holds thetumbler D in place, which latter is prevented from moving past itsnormal position by the shoulder or projection d striking against theshoulder 12 of the shackle. WVhen the dog 0 is in its normal lockingposition, itlies slightly diagonal across the look, its one end snuglyfitting in the curved recess 6', and its opposite end bears against thewall of the recess a. Any attempt to withdraw the shackle by force willbe frustrated by the dog C, as when the end thereof lying in the recessZ) of the shackle is drawn upward the opposite end is forced downwardand forced against the wall of said recess 1), and the shackle therebywedged in.

The number, size, and shape of teeth in the key and tumbler may bevaried to suit 1 keys are used in substantially the manner as herein setforth and described.

Having thus described my invention, What I claim as new is 1. In a lock,the combination of a shackle, an eccentrically-mounted dog-having aflexible spring-connection therewith, a toothed tumbler, and a toothedkey, substantially as described.

2. In alock, the combination ,with a shackle, of a dog constructed andoperating to engage and lock the shackle when the latter is retractedwithin the case or shell, and having a spring-connection with saidshackle,which operates to automatically impel the shackle outwardwhenthe dog is released from positive engagement with said shackle, andmeans for releasing the dog from positive locking engagement with theshackle, for the purpose described, substantially as set forth.

3. In alock, the combinatiomwith a shackle, of an eccentrically-mounteddog connected thereto and a toothed tumbler connected to the dog,whereby the tumbler when operated by the proper key is adapted to turnthe dog and release the shackle, substantially as and for the purposedescribed.

4. In a lock, the combinatiomwith a shackle, of an eccentrically-mounteddog, a flexible spring-connection intermediate of the dog and the leg ofthe shackle, and a toothed tumbler loosely mounted on the pivot of thedog and having a slot-and-pin connection with said dog, substantially asand for the purpose described.

5. In a lock, the combination of a casing having suitable recessestherein, an eccentrically-mounted dog having an edge lug and a lugprojecting up from one end thereof, a shackle having a lug at the bottomof the leg and at one side thereof, a coiled spring connecting the edgelug of the dog with the shackle-lug, a toothed tumbler having a slottherein engaging the end lug of the dog, and a toothed key for operatingthe parts, substantially as described.

In testimony whereof I atlix my signature in presence of two witnesses.

. ANDREW S. FISHER.

IVitnesses:

W. F. Moonn, JNo. G. FISHER.

